The Detective’s DeskVico Ash
Proposed deduction
“The destination is KRAP.”
MEDIUM · CASE FILE
The message on the reel
Medium · CEDAR PROJECTION BOOTH
A film canister carries an encoded destination. Four projectionists decoded it using the booth’s two-stage rule. Also reconstruct the review register: it records who examined which source, independently of whether their later proposed answer is correct. Review slots describe order, not travel or clock times.
Read the case file below, or open the interactive desk to examine records, keep notes and submit your reasoning. These are the case materials, without the solution.
Your assignment
Whose decoded destination is correct?
- The analytical records answer the analytical question; worksheet records establish the review reconstruction. Candidate proposals and supplementary recollections are claims to test.
- There are 3 ordered events. Use each listed person and item once in its column. “A immediately before B” means A is in the row directly above B, with no row between them.
- 4 verified records support the complete submission. Keep the separate context note out of the proof.
- No outside facts or unstated exceptions are required. The complete board and report are assessed together.
People and accounts
Wren Bell
Proposed deduction
“The destination is QBSL.”
Yani Reed
Proposed deduction
“The destination is MARK.”
Ula Ward
Proposed deduction
“The destination is PARK.”
Case records
Read each record on its own terms. A claim made by a person is different from a fact established by an independent record.
CONTEXT NOTE
Reel inventory
The canister contains one short silent film.
The film type gives no destination.
PRIMARY RECORD
Canister inscription
The complete inscription is LSBQ. Read the letters exactly as written.
This supplies the encoded source text.
LINKED RECORD
Booth cipher card
To decode, first replace every letter by the preceding alphabet letter (A becomes Z). Then reverse the resulting letter order.
This defines both decoding stages and their order.
RECONSTRUCTION RECORD
Review register
This is the same investigation’s document review record. There are 3 ordered events, labelled Review 1, Review 2, Review 3. Each listed person and item occurs exactly once. These slots describe record order, not times from the analytical problem.
- The event reviewed by Yani Reed occupies slot 3 (Review 3).
- The event reviewed by Wren Bell occurs immediately before the event reviewed by Ula Ward (consecutive rows, with no event between them).
Use each column’s choices exactly once. Verified relationships govern the board; proposed answers and later recollections do not override them.
RECONSTRUCTION RECORD
Review cross-check
The relationships below were verified independently. “A immediately before B” means A is in the row directly above B, with no row between them. Keep relationships from all worksheet sources together.
- The event involving “Canister inscription” occupies slot 2 (Review 2).
- The event involving “Reel inventory” occurs earlier than the event reviewed by Yani Reed, without claiming they are consecutive.
Use each column’s choices exactly once. Verified relationships govern the board; proposed answers and later recollections do not override them.
Questions to resolve
Match every recorded item to its handler or reviewer.
- Reel inventory
- Canister inscription
- Booth cipher card
When was the primary analytical record reviewed?
Use the interactive case desk to select your finding and cite the records that support it. The answer is checked there, and your progress stays in your browser.
Build your finding
Compare the records with each account. Work out what the evidence establishes, then separate that finding from anything it does not prove.